1: Energy Systems Last updated Save as PDF Page ID 46873 Nicholas M. Holden, Mary Leigh Wolfe, Jactone Arogo Ogejo, & Enda J. Cummins University College Dublin and Virginia Tech via Virginia Tech Libraries' Open Education Initiative 1.1: Bioenergy Conversion Systems 1.2: Biogas Energy from Organic Wastes 1.3: Biodiesel from Oils and Fats 1.4: Baling Biomass- Densification and Energy Requirements